Why subsidence claims can be rejected
Movement not considered subsidence
Cracking has many causes: thermal movement, shrinkage of new plaster, timber movement, settlement of a recent extension, or a lintel problem. If investigations point to one of these, the claim may fall outside the subsidence cover.
Pre-existing movement
Where evidence suggests the building moved before the policy started — historic distortion, previously filled cracks, old repairs — the insurer may say the damage is not new.
Drainage issues
Drainage findings cut both ways. A defective drain can be the accepted cause of movement, or it can be treated as a maintenance issue depending on the policy wording and the circumstances.
Poor workmanship
Inadequate foundations to an extension, a poorly formed structural opening or defective construction are commonly excluded as design or workmanship issues rather than subsidence.
Policy exclusions
Many policies exclude movement to paths, drives, patios, boundary walls and outbuildings unless the main building is damaged at the same time, and often apply a higher subsidence excess.
Insufficient evidence and disputes over causation
Sometimes monitoring is inconclusive, or the investigations carried out do not answer the question. The insurer may decline on the basis that the cause has not been established, which is a different position from saying subsidence did not occur.
What investigations might matter?
- Engineering evidence — a structural engineer’s report on the pattern, direction and likely mechanism of movement.
- Drainage surveys — CCTV footage and the accompanying report, including any recommended repairs.
- Monitoring — crack or level readings over time, and whether the period covered a full seasonal cycle.
- Site investigations where appropriate — trial pits, soil classification, moisture profiles and root identification.
You can ask the insurer for copies of the reports it relied upon. Reading them alongside an independent opinion is the usual way of testing whether the conclusion follows from the data.
What if substantial repairs are still required?
Structural movement does not pause during a dispute, and unresolved causes such as a leaking drain can allow damage to progress. Where a property is affected, owners often need to consider protecting the building and addressing the underlying cause while the insurance position is resolved.
If the insurer has accepted part of the claim but the amount does not appear to cover the works, see home insurance settlement too low. For the general steps that follow a refusal, including the complaint process, see declined home insurance claims. Background on the investigation process is in our subsidence insurance claims guide.